diff --git a/sys/gnu/fs/ext2fs/ext2_lookup.c b/sys/gnu/fs/ext2fs/ext2_lookup.c
index 261d85fe292a..6ab41e5aa1b4 100644
--- a/sys/gnu/fs/ext2fs/ext2_lookup.c
+++ b/sys/gnu/fs/ext2fs/ext2_lookup.c
@@ -1048,8 +1048,8 @@ ext2_checkpath(source, target, cred)
 		}
 		error = vn_rdwr(UIO_READ, vp, (caddr_t)&dirbuf,
 			sizeof (struct dirtemplate), (off_t)0, UIO_SYSSPACE,
-			IO_NODELOCKED | IO_NOMACCHECK, cred, NOCRED, (int *)0,
-			(struct thread *)0);
+			IO_NODELOCKED | IO_NOMACCHECK, cred, NOCRED, NULL,
+			NULL);
 		if (error != 0)
 			break;
 		namlen = dirbuf.dotdot_type;	/* like ufs little-endian */
diff --git a/sys/gnu/fs/ext2fs/ext2_vnops.c b/sys/gnu/fs/ext2fs/ext2_vnops.c
index 248c433e3e44..41643e3e739a 100644
--- a/sys/gnu/fs/ext2fs/ext2_vnops.c
+++ b/sys/gnu/fs/ext2fs/ext2_vnops.c
@@ -1048,8 +1048,7 @@ abortit:
 			error = vn_rdwr(UIO_READ, fvp, (caddr_t)&dirbuf,
 				sizeof (struct dirtemplate), (off_t)0,
 				UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
-				tcnp->cn_cred, NOCRED, (int *)0,
-				(struct thread *)0);
+				tcnp->cn_cred, NOCRED, NULL, NULL);
 			if (error == 0) {
 				/* Like ufs little-endian: */
 				namlen = dirbuf.dotdot_type;
@@ -1066,8 +1065,7 @@ abortit:
 					    (off_t)0, UIO_SYSSPACE,
 					    IO_NODELOCKED | IO_SYNC |
 					    IO_NOMACCHECK, tcnp->cn_cred,
-					    NOCRED, (int *)0,
-					    (struct thread *)0);
+					    NOCRED, NULL, NULL);
 					cache_purge(fdvp);
 				}
 			}
@@ -1203,7 +1201,7 @@ ext2_mkdir(ap)
 	error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)&dirtemplate,
 	    sizeof (dirtemplate), (off_t)0, UIO_SYSSPACE,
 	    IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED,
-	    (int *)0, (struct thread *)0);
+	    NULL, NULL);
 	if (error) {
 		dp->i_nlink--;
 		dp->i_flag |= IN_CHANGE;
@@ -1340,7 +1338,7 @@ ext2_symlink(ap)
 	} else
 		error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0,
 		    UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
-		    ap->a_cnp->cn_cred, NOCRED, (int *)0, (struct thread *)0);
+		    ap->a_cnp->cn_cred, NOCRED, NULL, NULL);
 	if (error)
 		vput(vp);
 	return (error);
diff --git a/sys/kern/kern_acct.c b/sys/kern/kern_acct.c
index 7ec74a2a8765..049600a338b1 100644
--- a/sys/kern/kern_acct.c
+++ b/sys/kern/kern_acct.c
@@ -436,7 +436,7 @@ acct_process(struct thread *td)
 	vfslocked = VFS_LOCK_GIANT(acct_vp->v_mount);
 	ret = vn_rdwr(UIO_WRITE, acct_vp, (caddr_t)&acct, sizeof (acct),
 	    (off_t)0, UIO_SYSSPACE, IO_APPEND|IO_UNIT, acct_cred, NOCRED,
-	    (int *)0, td);
+	    NULL, td);
 	VFS_UNLOCK_GIANT(vfslocked);
 	sx_sunlock(&acct_sx);
 	return (ret);
diff --git a/sys/ufs/ufs/ufs_lookup.c b/sys/ufs/ufs/ufs_lookup.c
index fddefc593c62..ea73b1ff8616 100644
--- a/sys/ufs/ufs/ufs_lookup.c
+++ b/sys/ufs/ufs/ufs_lookup.c
@@ -1247,7 +1247,7 @@ ufs_dir_dd_ino(struct vnode *vp, struct ucred *cred, ino_t *dd_ino)
 		return (ENOTDIR);
 	error = vn_rdwr(UIO_READ, vp, (caddr_t)&dirbuf,
 	    sizeof (struct dirtemplate), (off_t)0, UIO_SYSSPACE,
-	    IO_NODELOCKED | IO_NOMACCHECK, cred, NOCRED, (int *)0, NULL);
+	    IO_NODELOCKED | IO_NOMACCHECK, cred, NOCRED, NULL, NULL);
 	if (error != 0)
 		return (error);
 #if (BYTE_ORDER == LITTLE_ENDIAN)
diff --git a/sys/ufs/ufs/ufs_vnops.c b/sys/ufs/ufs/ufs_vnops.c
index 38c2543c40ba..371c4625ba55 100644
--- a/sys/ufs/ufs/ufs_vnops.c
+++ b/sys/ufs/ufs/ufs_vnops.c
@@ -1849,7 +1849,7 @@ ufs_symlink(ap)
 	} else
 		error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0,
 		    UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
-		    ap->a_cnp->cn_cred, NOCRED, (int *)0, (struct thread *)0);
+		    ap->a_cnp->cn_cred, NOCRED, NULL, NULL);
 	if (error)
 		vput(vp);
 	return (error);